diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 29f8b86..8f35c7b 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -56,6 +56,7 @@
 	-if exist small.vim del small.vim
 	-if exist tiny.vim del tiny.vim
 	-if exist mbyte.vim del mbyte.vim
+	-if exist mzscheme.vim del mzscheme.vim
 	-del X*
 	-if exist viminfo del viminfo